JP2015174036A - 目封止ハニカム構造体 - Google Patents
目封止ハニカム構造体 Download PDFInfo
- Publication number
- JP2015174036A JP2015174036A JP2014052418A JP2014052418A JP2015174036A JP 2015174036 A JP2015174036 A JP 2015174036A JP 2014052418 A JP2014052418 A JP 2014052418A JP 2014052418 A JP2014052418 A JP 2014052418A JP 2015174036 A JP2015174036 A JP 2015174036A
- Authority
- JP
- Japan
- Prior art keywords
- honeycomb structure
- porous body
- plugged honeycomb
- mass
- plugged
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011521 glass Substances 0.000 claims abstract description 55
- 229910000505 Al2TiO5 Inorganic materials 0.000 claims abstract description 47
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 claims abstract description 47
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 238000005192 partition Methods 0.000 claims description 77
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 72
- 239000000463 material Substances 0.000 claims description 55
- 239000011148 porous material Substances 0.000 claims description 31
- 239000006104 solid solution Substances 0.000 claims description 17
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 12
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- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 3
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 3
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
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- 239000013618 particulate matter Substances 0.000 description 2
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- GEIAQOFPUVMAGM-UHFFFAOYSA-N ZrO Inorganic materials [Zr]=O GEIAQOFPUVMAGM-UHFFFAOYSA-N 0.000 description 1
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- 229910010293 ceramic material Inorganic materials 0.000 description 1
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- 238000007561 laser diffraction method Methods 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
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Images
Classifications
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- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
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Abstract
【解決手段】流体の流路となる第一端面11から第二端面12まで延びる複数のセル2を区画形成する多孔質の隔壁1を有する柱状のハニカム構造部4と、第一端面11における所定のセル2bの開口部、及び第二端面12における残余のセル2aの開口部に配設された目封止部5と、を備え、隔壁1が、主相としてα−Al2O3を含み、更にチタン酸アルミニウムとガラスを含む多孔体からなる、目封止ハニカム構造体100。
【選択図】図1
Description
C−0.007×α2 ≧ 4.20 ・・・ (1)
(但し、上記式(1)において、Cは、前記多孔体を構成する材料の600℃における熱容量(J/K/cm3)を示し、αは、前記多孔体の40〜800℃における平均熱膨張係数(ppm/K)を示す。)
(但し、上記式(2)において、Cは、多孔体を構成する材料の600℃における熱容量(J/K/cm3)を示し、αは、多孔体の40〜800℃における平均熱膨張係数(ppm/K)を示す。)
C−0.007×α2 ≧ 4.20 ・・・ (3)
(但し、上記式(3)において、Cは、多孔体を構成する材料の600℃における熱容量(J/K/cm3)を示し、αは、多孔体の40〜800℃における平均熱膨張係数(ppm/K)を示す。)
実施例1においては、表1に示す、α−Al2O3の(1)、TiO2、タルクの(1)、及びマイカを用いて、成形原料を調製した。表2に、実施例1の成形原料の配合処方(単位:g)を示す。また、表2の「Al2O3/TiO2」の欄に、実施例1の成形原料に用いられるα−Al2O3の粉末に含まれる「Al2O3」と、TiO2の粉末に含まれる「TiO2」とのモル比(Al2O3/TiO2)を示す。
表2に示すような配合処方にて、実施例1と同様の方法で、目封止ハニカム構造体を作製した。実施例15においては、造孔材として添加する澱粉の量を500gとした。実施例2〜15の目封止ハニカム構造体を構成する隔壁(多孔体)の組成を、実施例1と同様の方法で定性、定量した。表3に、実施例2〜15の目封止ハニカム構造体を構成する隔壁(多孔体)の組成を示す。また、真密度(g/cm3)、気孔率(%)、平均細孔径(μm)、熱容量(J/K/cm3)、及びCTE(ppm/K)を、実施例1と同様の方法で測定した。測定結果を表3に示す。また、「C−0.007×α2」の値である「F」についても算出した。「F」の値を表3に示す。
表1のα−Al2O3の(1)、TiO2、タルク(1)、及びマイカを用いて、実施例1と同様の方法で、目封止ハニカム構造体を作製した。比較例1における成形原料の配合処方は、α−Al2O3の(1)を2550g、TiO2を1950g、タルクの(1)を350g、マイカを150gとした。造孔材、バインダー、及び水の添加量は、実施例1と同じにした。
比較例2においては、平均粒子径12μmのα−SiC粉末と、平均粒子径2μmのα−SiC粉末とを用いて、成形原料を調製した。上記各粉末の使用量は、平均粒子径12μmのα−SiC粉末が3000g、平均粒子径2μmのα−SiC粉末の量が2000gである。また、成形原料には、バインダーとしてのメチルセルロースを300g、適量の水を添加した。比較例2においては、上記のように成形原料を調製し、且つ、ハニカム乾燥体の焼成を、アルゴン雰囲気中、2200℃で2時間としたこと以外は、実施例1と同様の方法で、目封止ハニカム構造体を作製した。
比較例3においては、平均粒子径3μmのカオリン粉末と、平均粒子径24μmのタルク粉末と、平均粒子径6μmのアルミナ粉末と、平均粒子径21μmのシリカ粉末とを用いて、成形原料を調製した。上記各粉末の使用量は、カオリン粉末が1110g、タルク粉末が2135g、アルミナ粉末が1210g、シリカ粉末が540gである。造孔材、バインダー、及び水の添加量は、実施例1と同じにした。上記のように成形原料を調製し、且つ、ハニカム乾燥体の焼成を、1420℃で4時間としたこと以外は、実施例1と同様の方法で、目封止ハニカム構造体を作製した。
実施例1の目封止ハニカム構造体は、比較例1〜3の目封止ハニカム構造体に比して、熱容量(J/K/cm3)が大きなものであった。α−Al2O3とAl2TiO5との質量比率を変えることにより、熱容量(J/K/cm3)が変化し、実施例2〜4の目封止ハニカム構造体は、実施例1の目封止ハニカム構造体よりも熱容量(J/K/cm3)が大きなものであった。実施例5は、α−Al2O3の質量比が60質量%を下回っていた。そのため、実施例1よりも熱容量が小さかった。実施例6は、α−Al2O3の質量比が90質量%を上回っていた。そのため、実施例4よりもCTEが大きかった。実施例7,8の目封止ハニカム構造体においては、ガラスの質量比率が、実施例3の目封止ハニカム構造体に比して少なくなっていた。ガラスの質量比率が少なくなると、気孔率が大きくなる傾向が確認された。目封止ハニカム構造体の隔壁の気孔率が大きくなると、強度が低下することがある。実施例9の目封止ハニカム構造体においては、ガラスの質量比率が、実施例1の目封止ハニカム構造体に比して多くなっていた。実施例9の目封止ハニカム構造体は、実施例1の目封止ハニカム構造体よりも熱容量(J/K/cm3)が小さなものであった。
Claims (15)
- 流体の流路となる第一端面から第二端面まで延びる複数のセルを区画形成する多孔質の隔壁を有する柱状のハニカム構造部と、
前記第一端面における所定のセルの開口部、及び前記第二端面における残余のセルの開口部に配設された目封止部と、を備え、
前記隔壁が、主相としてα−Al2O3を含み、更にチタン酸アルミニウムとガラスを含む多孔体からなる、目封止ハニカム構造体。 - 前記多孔体の前記α−Al2O3と前記チタン酸アルミニウムとの質量比率が、60/40〜90/10である、請求項1に記載の目封止ハニカム構造体。
- 前記多孔体は、前記チタン酸アルミニウムにFe、Mg、及びSiからなる第一群より選択される少なくとも1種の成分が固溶したものである、請求項1又は2に記載の目封止ハニカム構造体。
- 前記チタン酸アルミニウムに含まれるAl及びTiを酸化物換算したAl2O3及びTiO2の質量と当該チタン酸アルミニウムに含まれる固溶成分を酸化物換算した質量の合計質量に対する、当該チタン酸アルミニウムに含まれる前記固溶成分のうちのFe、Mg、及びSiを酸化物換算したFe2O3、MgO、及びSiO2の各質量の比率が、0.1〜10.0質量%である、請求項3に記載の目封止ハニカム構造体。
- 前記多孔体が、前記α−Al2O3と前記チタン酸アルミニウムと前記ガラスの合計100質量%に対して、前記ガラスを5〜15質量%含む、請求項1〜4のいずれか一項に記載の目封止ハニカム構造体。
- 前記ガラスが、SiO2、及びAl2O3を含む、請求項1〜5のいずれか一項に記載の目封止ハニカム構造体。
- 前記ガラスが、アルカリ金属、アルカリ土類金属、Ti、及びFeからなる群より選択される少なくとも1種の成分からなる酸化物を更に含む、請求項6に記載の目封止ハニカム構造体。
- 前記多孔体を構成する材料の真密度が、3.65〜3.85g/cm3である、請求項1〜7のいずれか一項に記載の目封止ハニカム構造体。
- 前記多孔体を構成する材料の600℃における熱容量が、4.25〜4.50J/K/cm3である、請求項1〜8のいずれか一項に記載の目封止ハニカム構造体。
- 前記多孔体の40〜800℃における平均熱膨張係数が、2.5〜6.0ppm/Kである、請求項1〜9のいずれか一項に記載の目封止ハニカム構造体。
- 前記多孔体が、下記式(1)の関係を満たす、請求項1〜10のいずれか一項に記載の目封止ハニカム構造体。
C−0.007×α2 ≧ 4.20 ・・・ (1)
(但し、上記式(1)において、Cは、前記多孔体を構成する材料の600℃における熱容量(J/K/cm3)を示し、αは、前記多孔体の40〜800℃における平均熱膨張係数(ppm/K)を示す。) - 前記多孔体の気孔率が、20〜50%である、請求項1〜11のいずれか一項に記載の目封止ハニカム構造体。
- 前記多孔体の平均細孔径が、5〜20μmである、請求項1〜12のいずれか一項に記載の目封止ハニカム構造体。
- 前記ハニカム構造部が、前記隔壁を有する柱状のハニカムセグメントを、複数個有し、複数個の前記ハニカムセグメントの互いの側面同士が対向するように隣接して配置された状態で接合されたセグメント構造である、請求項1〜13のいずれか一項に記載の目封止ハニカム構造体。
- 前記ハニカム構造部の前記隔壁の表面及び前記隔壁の細孔のうちの少なくとも一方に、排ガス浄化用の触媒が担持されている、請求項1〜14のいずれか一項に記載の目封止ハニカム構造体。
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